PROCESS OF PRETREATING A POZZOLANIC MATERIAL FOR INCREASING THE POZZOLANIC PROPERTIES OF SAID MATERIAL

摘要

AbstractThe pozzolanic properties of a pozzolanic material,more particularly a fly ash, are improved by mixing thepozzolanic material with a calciumoxyde or calciumhydroxidecontaining material and water in such a way that at thetime of associating or bringing together the abovementionedcomponents the mixture has or immediately attains a tempera-ture of more than 50°C, preferably at least 80°C, mostpreferably 85 to 100°C.A mixture of pozzolanic material and calciumoxydeand/or calciumhydroxide may be preheated, subsequently,water being added to said mixture.Water as used may be hot water and said water ispreferably added as one mass at one moment.The pozzolanic material obtained from the processof the invention is suitable as cement substitute, asmaterial for manufacturing building articles and a binderfor occluding one or more fillers to be introduced into achemical process or one or more fillers presenting noxiousproperties.